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CVE-2026-74594 (GCVE-0-2026-74594)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40
VLAI
Title
sched/psi: Shut down rtpoll_timer in psi_cgroup_free()
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Shut down rtpoll_timer in psi_cgroup_free() psi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath and can race psi_trigger_destroy() taking down the last rtpoll trigger under rtpoll_trigger_lock: psi_schedule_rtpoll_work() psi_trigger_destroy() rcu_read_lock(); task = rcu_dereference(rtpoll_task); rcu_assign_pointer(rtpoll_task, NULL); timer_delete(&rtpoll_timer); mod_timer(&rtpoll_timer, ...); rcu_read_unlock(); synchronize_rcu(); kthread_stop(task_to_destroy); The group can then be freed with the re-armed timer still pending, and poll_timer_fn() runs on freed memory. 461daba06bdc ("psi: eliminate kthread_worker from psi trigger scheduling mechanism") deleted the timer synchronously after the synchronize_rcu(), which prevented this but raced trigger creation instead: the deletion could cancel the timer that a new trigger set armed during the grace period and, as creation also reinitialized the timer at the time, corrupt it. 8f91efd870ea ("psi: Fix race between psi_trigger_create/destroy") moved the initialization into group_init() and the deletion into the locked section, trading the creation races for the window above. Neither placement in the destruction path works. A pending timer firing while the group is alive is harmless though. poll_timer_fn() just wakes the rtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's lifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it by then. timer_shutdown_sync() because the timer is never armed again.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6bfcb6178925b1fd28c102e53d403091b8f49396 , < 4addb102154b7cf6e2310ccbe20c3c08619e520d (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 894a9300d7fb2e2951da92e565ae6de7ddfb0a69 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 1e5ca82eee59caca6988f9d6e859786aab8a5fa0 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 310b5a537a78c358a4cd244bd767c1a517a05459 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 8037c5b2b2a447df52542f4d8535895d837bdcbd (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 611e7821c4f83a671455658797336faecc3a5196 (git)
Affected: 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 , < 5457025fa8ca3c0d2732109513de839e3e797190 (git)
Affected: e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49 (git)
Affected: 979965c33f734a1666af67900408f997ac669c23 (git)
Affected: 5.10.50 , < 5.10.266 (semver)
Affected: 5.12.17 , < 5.13 (semver)
Affected: 5.13.2 , < 5.14 (semver)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/psi: Shut down rtpoll_timer in psi_cgroup_free()\n\npsi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath\nand can race psi_trigger_destroy() taking down the last rtpoll trigger under\nrtpoll_trigger_lock:\n\n  psi_schedule_rtpoll_work()        psi_trigger_destroy()\n\n  rcu_read_lock();\n  task = rcu_dereference(rtpoll_task);\n                                    rcu_assign_pointer(rtpoll_task, NULL);\n                                    timer_delete(\u0026rtpoll_timer);\n  mod_timer(\u0026rtpoll_timer, ...);\n  rcu_read_unlock();\n                                    synchronize_rcu();\n                                    kthread_stop(task_to_destroy);\n\nThe group can then be freed with the re-armed timer still pending, and\npoll_timer_fn() runs on freed memory.\n\n461daba06bdc (\"psi: eliminate kthread_worker from psi trigger scheduling\nmechanism\") deleted the timer synchronously after the synchronize_rcu(),\nwhich prevented this but raced trigger creation instead: the deletion could\ncancel the timer that a new trigger set armed during the grace period and,\nas creation also reinitialized the timer at the time, corrupt it.\n8f91efd870ea (\"psi: Fix race between psi_trigger_create/destroy\") moved the\ninitialization into group_init() and the deletion into the locked section,\ntrading the creation races for the window above.\n\nNeither placement in the destruction path works. A pending timer firing\nwhile the group is alive is harmless though. poll_timer_fn() just wakes the\nrtpoll waitqueue and doesn\u0027t re-arm itself. Bind the timer to the group\u0027s\nlifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it\nby then. timer_shutdown_sync() because the timer is never armed again."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - Reachable only via local kernel interfaces: writing cgroup *.pressure or /proc/pressure/*, closing the trigger fd, and removing the cgroup; the race involves scheduler hotpath callbacks, not any network protocol.\nAC:L - The attacker controls both race participants\u2014closing/destroying the last privileged PSI trigger while concurrently driving psi_schedule_rtpoll_work() via cgroup task scheduling or the psimon worker\u2014so the mod_timer-after-timer_delete window is reliably winnable.\nPR:L - The vulnerable rtpoll path requires CAP_SYS_RESOURCE (non-2s PSI windows); that capability is available to an unprivileged user who creates a user namespace, and cgroup pressure files are writable under delegated cgroup v2 hierarchies in that namespace.\nUI:N - Exploitation is fully self-driven: the attacker creates the trigger, races its teardown against scheduler activity, and deletes the cgroup; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is confined to kernel memory corruption and potential local privilege escalation within the same kernel security authority; it does not cross a VM, container runtime, or IOMMU trust boundary.\nC:H - After psi_cgroup_free() the pending rtpoll_timer fires poll_timer_fn() on a freed psi_group, a classic use-after-free that can expose or corrupt adjacent slab contents and be developed into arbitrary kernel memory read primitives.\nI:H - poll_timer_fn() performs atomic_set() on group-\u003ertpoll_wakeup and wake_up_interruptible() on group-\u003ertpoll_wait after the psi_group is freed, giving attacker-influenced writes into a recycled kmem object suitable for control-flow hijacking.\nA:H - Timer execution on freed psi_group memory can cause immediate kernel oops/panic from invalid pointer dereferences or list corruption, and the race can be retriggered for sustained denial of service on shared cloud/container hosts."
            }
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        "dateUpdated": "2026-08-25T05:40:21.246Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d"
        },
        {
          "url": "https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459"
        },
        {
          "url": "https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08"
        },
        {
          "url": "https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196"
        },
        {
          "url": "https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190"
        }
      ],
      "title": "sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74594",
    "datePublished": "2026-08-22T15:31:44.894Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:21.246Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74594",
      "date": "2026-09-17",
      "epss": "0.00129",
      "percentile": "0.02927"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:53:00.000Z",
      "cve": "CVE-2026-74594",
      "id": "msrc_CVE-2026-74594",
      "initial_release_date": "2026-08-24T01:10:54.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74594.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74594\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:31.680\",\"lastModified\":\"2026-08-25T06:18:34.890\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/psi: Shut down rtpoll_timer in psi_cgroup_free()\\n\\npsi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath\\nand can race psi_trigger_destroy() taking down the last rtpoll trigger under\\nrtpoll_trigger_lock:\\n\\n  psi_schedule_rtpoll_work()        psi_trigger_destroy()\\n\\n  rcu_read_lock();\\n  task = rcu_dereference(rtpoll_task);\\n                                    rcu_assign_pointer(rtpoll_task, NULL);\\n                                    timer_delete(\u0026rtpoll_timer);\\n  mod_timer(\u0026rtpoll_timer, ...);\\n  rcu_read_unlock();\\n                                    synchronize_rcu();\\n                                    kthread_stop(task_to_destroy);\\n\\nThe group can then be freed with the re-armed timer still pending, and\\npoll_timer_fn() runs on freed memory.\\n\\n461daba06bdc (\\\"psi: eliminate kthread_worker from psi trigger scheduling\\nmechanism\\\") deleted the timer synchronously after the synchronize_rcu(),\\nwhich prevented this but raced trigger creation instead: the deletion could\\ncancel the timer that a new trigger set armed during the grace period and,\\nas creation also reinitialized the timer at the time, corrupt it.\\n8f91efd870ea (\\\"psi: Fix race between psi_trigger_create/destroy\\\") moved the\\ninitialization into group_init() and the deletion into the locked section,\\ntrading the creation races for the window above.\\n\\nNeither placement in the destruction path works. A pending timer firing\\nwhile the group is alive is harmless though. poll_timer_fn() just wakes the\\nrtpoll waitqueue and doesn\u0027t re-arm itself. Bind the timer to the group\u0027s\\nlifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it\\nby then. timer_shutdown_sync() because the timer is never armed again.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/sched/psi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6bfcb6178925b1fd28c102e53d403091b8f49396\",\"lessThan\":\"4addb102154b7cf6e2310ccbe20c3c08619e520d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"894a9300d7fb2e2951da92e565ae6de7ddfb0a69\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"1e5ca82eee59caca6988f9d6e859786aab8a5fa0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"310b5a537a78c358a4cd244bd767c1a517a05459\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"8037c5b2b2a447df52542f4d8535895d837bdcbd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"611e7821c4f83a671455658797336faecc3a5196\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\"lessThan\":\"5457025fa8ca3c0d2732109513de839e3e797190\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"979965c33f734a1666af67900408f997ac669c23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.50\",\"lessThan\":\"5.10.266\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.12.17\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.13.2\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/sched/psi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:49:54+00:00",
      "cve": "CVE-2026-74594",
      "id": "CVE-2026-74594",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "48",
      "product_status:known_not_affected": "226",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched/psi: Shut down rtpoll_timer in psi_cgroup_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74594.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:18:15Z",
      "cve": "CVE-2026-74594",
      "id": "CVE-2026-74594",
      "initial_release_date": "2026-08-23T00:06:18Z",
      "product_status:known_affected": "214",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74594",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74594.json",
      "version": "7"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.